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Post by artyman on Nov 28, 2020 0:13:35 GMT
Attachment DeletedAttachment DeletedAttachment DeletedHi all, ...........Been a while but here I am again Attached (or below) are 3 images of my P Bracket as seen from the inside of my Sunlight 30 (1989) I had the same problem with the earth bonding strip corroding away from the P bracket. Drilling and chiselling deep into the fibre glass (molehill) eventually enabled me to discover how the earth strip was attached to the P Bracket. See the image with a bolt sticking out with a cheap, single electrical connector attached. Replaced the bolt, the earth braid and its electrical connection then rebuilt the molehill with thickened Fibreglass. Interesting exercise, breathing mask definitely needed. No problems since. Bob Portland, Dorset
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Erik
Junior Member
Posts: 20
Jeanneau Model: Sun Odyssey 39i
Yacht Name: Miss Charlotte
Home Port: Port Washington, NY
Country: USA
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Post by Erik on Mar 22, 2021 13:02:50 GMT
All, As stated earlier, I have jury rigged a new internal connection between the engine and the propeller bracket by connecting onto the stub sticking out of the top of the propeller bracket housing but am not confident in its long term viability. In October the boat was pulled out for new bottom paint. At that time I had a 50mm clam shell anodes attached to the bracket. See the picture below. At that time, the folks doing the bottom paint also polished the propeller and propeller bracket. Of particular interest to this thread may be the condition of the bracket. As can be seen, the metal is very pitted. I cannot say how long the interior connection was undone. (I purchased the boat this summer and the survey found it unconnected.) I suspect it was for some time. The question now is will the clam shell anodes, and somewhat suspect internal connection, prevent further degradation of the bracket? Any comments welcome as I'd prefer not to learn the hard way that these fixes don't work. Replacing the propeller bracket looks to be extensive and costly. Regards, Mark www.23hq.com/MThackray/photo/62564595/originalThe corrosion of the p-bracket braided bonding wire seems to be a common issue. I went to check mine on my 2007 Jeanneau SO 39i and it crumbled with the lightest touch leaving just a corroded stub sticking out. It seems that the standard solution is to add a pair of zinc clamshell anodes to the p-bracket, and this is what I intend to do before the boat is launched next month. I assume the idea is to drill a 5mm hole (or equivalent) right through the p-bracket and to fit the clamshell to both sides of the p-bracket? How difficult is it to drill through the bronze p-bracket?
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Post by MalcolmP on Mar 22, 2021 13:19:38 GMT
The corrosion of the p-bracket braided bonding wire seems to be a common issue. I went to check mine on my 2007 Jeanneau SO 39i and it crumbled with the lightest touch leaving just a corroded stub sticking out. It seems that the standard solution is to add a pair of zinc clamshell anodes to the p-bracket, and this is what I intend to do before the boat is launched next month. I assume the idea is to drill a 5mm hole (or equivalent) right through the p-bracket and to fit the clamshell to both sides of the p-bracket? How difficult is it to drill through the bronze p-bracket? Drilled very easily with a good sharp drill.
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Erik
Junior Member
Posts: 20
Jeanneau Model: Sun Odyssey 39i
Yacht Name: Miss Charlotte
Home Port: Port Washington, NY
Country: USA
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Post by Erik on Mar 22, 2021 13:22:20 GMT
Thanks. I'll post pictures when I'm done.
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Post by shawnkaplan on Mar 25, 2021 2:43:50 GMT
Question on the clamshell. Makes sense to reduce pitting. But seems the braided wire still needs to be re-attached to the interior of the PBracket? Or is adding the anode somehow negate that necessity?
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Erik
Junior Member
Posts: 20
Jeanneau Model: Sun Odyssey 39i
Yacht Name: Miss Charlotte
Home Port: Port Washington, NY
Country: USA
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Post by Erik on Mar 31, 2021 22:39:29 GMT
Question on the clamshell. Makes sense to reduce pitting. But seems the braided wire still needs to be re-attached to the interior of the PBracket? Or is adding the anode somehow negate that necessity? Here's how I understand it: At the factory, the P-bracket is connected via the wire braid inside the boat to the engine. The engine is connected to the shaft and propeller, which have zincs. These zincs protect the P-bracket (via the engine and wire braid). Note that the rubber in the cutlass bearing means that the P-bracket does not make direct electrical contact with the shaft. If the wire braid corrodes (which seems to have happened to many of us) then the P-bracket is no longer protected by the zincs on the propeller and shaft. It's unclear to what extent this is a problem. To be on the safe side, there are two options to fix the problem: - Drill into the fiberglass molehill inside the boat until you reach the p-bracket, then attach a new wire braid (or regular wire?), then repair the fiberglass. This could be a long and complicated project according to some other posts, and if you screw it up you could have a leak.
- Drill a hole through the P-bracket to through-bolt a pair of clamshell style zinc anodes (the kind used on power boat trim tabs). This is a 20-30 minute project (2 days in my case as my cordless drill ran out of power drilling through the P-bracket... it's about 15 minutes of drilling to get through, at least it was in my case). These new anodes will protect the P-bracket directly.
Let me know if anyone sees this differently.
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